/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /**  * Java(TM) SE 6 version  *  * @author  Marianne Mueller  * @author  Kathy Walrath  */import java.awt.*;import java.awt.event.*;import javax.swing.*;public class GetOpenProperties extends JApplet {    private String[] propertyNames = {"file.separator",                                      "line.separator",                                      "path.separator",                                      "java.class.version",                                      "java.vendor",                                      "java.vendor.url",                                      "java.version",                                      "os.name",                                      "os.arch",                                      "os.version"};    private final int numProperties = propertyNames.length;    private JLabel[] values;    private javax.swing.Timer timer;    private int currentPropNum = 0;    public void init() {        //Execute a job on the event-dispatching thread:        //creating this applet's GUI.        try {            SwingUtilities.invokeAndWait(new Runnable() {                public void run() {                    createGUI();                }            });        } catch (Exception e) {            System.err.println("createGUI didn't successfully complete");        }    }        public void start() {        //Update the GUI every 1/4 second or so.        timer = new javax.swing.Timer(250, new PropertyUpdater());        timer.setCoalesce(false);        timer.start();        }        public void stop() {        if (timer != null) {            timer.stop();        }    }        public void destroy() {        //Execute a job on the event-dispatching thread:        //destroying this applet's GUI.        try {            SwingUtilities.invokeAndWait(new Runnable() {                public void run() {                    remove(getContentPane());                }            });        } catch (Exception e) { }            }    private void createGUI() {              JPanel contentPane = new JPanel(new GridBagLayout());                GridBagConstraints labelConstraints =                 new GridBagConstraints();        GridBagConstraints valueConstraints =                 new GridBagConstraints();        labelConstraints.anchor = GridBagConstraints.WEST;        labelConstraints.ipadx = 10;        valueConstraints.fill = GridBagConstraints.HORIZONTAL;        valueConstraints.gridwidth = GridBagConstraints.REMAINDER;        valueConstraints.weightx = 1.0; //Extra space to values column.        //Set up the Label arrays.        JLabel[] names = new JLabel[numProperties];        values = new JLabel[numProperties];        String firstValue = "<not read yet>";                //Fonts        Font headingFont = new Font("SansSerif", Font.BOLD, 14);        Font propertyFont = new Font("SansSerif", Font.BOLD, 12);        Font valueFont = new Font("SansSerif", Font.PLAIN, 12);         //Add headings.        contentPane.add(createHeading("Property Name", headingFont), labelConstraints);        contentPane.add(createHeading("Value", headingFont), valueConstraints);        for (int i = 0; i < numProperties; i++) {            names[i] = new JLabel(propertyNames[i]);            names[i].setFont(propertyFont);            contentPane.add(names[i], labelConstraints);            values[i] = new JLabel(firstValue);            values[i].setFont(valueFont);            contentPane.add(values[i], valueConstraints);                        names[i].setLabelFor(values[i]);        }                contentPane.setBorder(BorderFactory.createCompoundBorder(                                    BorderFactory.createLineBorder(Color.black),                                    BorderFactory.createEmptyBorder(5,20,5,10)));        setContentPane(contentPane);    }        private JLabel createHeading(String text, Font font) {        JLabel l = new JLabel(text);        l.setFont(font);        l.setBorder(BorderFactory.createCompoundBorder(                        BorderFactory.createEmptyBorder(0,0,5,0),                        BorderFactory.createMatteBorder(0,0,1,0,Color.black)));        return l;    }        private class PropertyUpdater implements ActionListener {        private String value;        public void actionPerformed(ActionEvent e) {            if (currentPropNum < numProperties) {                try {                    value = System.getProperty(propertyNames[currentPropNum]);                    if (value == null) {                        value = "<null value!>";                    }                    values[currentPropNum].setText(value);                } catch (SecurityException exc) {                    values[currentPropNum].setText("Could not read: SECURITY EXCEPTION!");                }                currentPropNum++;            } else {                timer.stop();            }        }    }}